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I: The standard abbreviation for investment expenditures by the business sector, especially when used in the study of macroeconomics. This abbreviation is most often seen in the aggregate expenditure equation, AE = C + I + G + (X - M), where C, G, and (X - M) represent expenditures by the other three macroeconomic sectors, household, business, and foreign.

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FOUR-SECTOR, THREE-MARKET CIRCULAR FLOW

A circular flow model of the macroeconomy containing four sectors (business, household, government, and foreign) and three markets (product, factor, and financial) that illustrates the continuous movement of the payments for goods and services between producers and consumers, with particular emphasis on exports and imports. Other circular models are two-sector, two-market circular flow; two-sector, three-market circular flow; and three-sector, three-market circular flow.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either several magazines on computer software or a T-shirt commemorating the second moon landing. Be on the lookout for telephone calls from long-lost relatives.
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In the early 1900s around 300 automobile companies operated in the United States.
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ACCR
Annual Cost of Capital Recovery
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